import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:kooltap/l10n/app_localizations.dart';
import 'package:kooltap/models/bar_tab.dart';
import 'package:kooltap/utils/name_index.dart';
import 'package:kooltap/views/bar/selected_tab_details.dart';
import 'package:kooltap/views/bar/tab_panel.dart';

const _names = [
  'Zoë', 'anna', 'Émile', 'Bram', 'Mieke', 'Marc', 'Ward', 'Tom', 'Sofie', //
  'Lotte', 'Koen', 'Jan', 'Inge', 'Hanne', 'Greet', 'Frank', 'Dirk', 'Chris',
  'Nele', 'Olaf', 'Pieter', 'Rik', 'Vera', 'Yves', '2de tafel', 'Eva',
];

void main() {
  group('name index', () {
    test('folds case and accents into the index letter', () {
      expect(indexLetterOf('émile'), 'E');
      expect(indexLetterOf('Zoë'), 'Z');
      expect(indexLetterOf('  anna'), 'A');
      expect(indexLetterOf('2de tafel'), '#');
      expect(indexLetterOf(''), '#');
    });

    test('sorts A–Z regardless of case and accents, # last', () {
      final sorted = ['Zoë', 'émile', 'Eva', 'anna', '2de tafel', 'Bram']
        ..sort(compareByIndex);

      expect(sorted, ['anna', 'Bram', 'émile', 'Eva', 'Zoë', '2de tafel']);
    });
  });

  group('TabPanel letter index', () {
    final tabs = [
      for (final (index, name) in _names.indexed)
        BarTab(
          id: 'tab-$index',
          customerName: name,
          openedAt: DateTime(2026, 10, 11, 12, index),
          items: const [],
        ),
    ];

    Future<void> pumpPanel(
      WidgetTester tester, {
      bool showSearch = false,
      BarTab? selectedTab,
    }) async {
      tester.view.physicalSize = const Size(500, 800);
      tester.view.devicePixelRatio = 1;
      addTearDown(tester.view.reset);

      await tester.pumpWidget(
        MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: Scaffold(
            body: TabPanel(
              tabs: tabs,
              selectedTab: selectedTab,
              selectedTabId: selectedTab?.id,
              showSearch: showSearch,
              onTabSelected: (_) {},
              onItemQuantityChanged: (_, _) async {},
              onCloseTabPressed: () {},
              onTabEdited: (_) async {},
              onTabDeleted: (_) async {},
            ),
          ),
        ),
      );
    }

    String firstVisibleName(WidgetTester tester) {
      final list = tester.getRect(find.byType(OpenTabsList));
      final visible = _names.where((name) {
        final finder = find.text(name);
        if (finder.evaluate().isEmpty) return false;
        final rect = tester.getRect(finder);
        return rect.top >= list.top && rect.bottom <= list.bottom;
      }).toList();

      return visible.reduce(
        (a, b) =>
            tester.getRect(find.text(a)).top < tester.getRect(find.text(b)).top
            ? a
            : b,
      );
    }

    Future<void> tapLetter(WidgetTester tester, String letter) async {
      await tester.tap(
        find.descendant(
          of: find.byWidgetPredicate(
            (widget) => widget.runtimeType.toString() == '_LetterIndexBar',
          ),
          matching: find.text(letter),
        ),
      );
      await tester.pumpAndSettle();
    }

    testWidgets('lists the tabs alphabetically', (tester) async {
      await pumpPanel(tester);

      expect(firstVisibleName(tester), 'anna');
    });

    testWidgets('tapping a letter scrolls to its first name', (tester) async {
      await pumpPanel(tester);

      await tapLetter(tester, 'M');
      expect(firstVisibleName(tester), 'Marc');

      await tapLetter(tester, 'E');
      expect(firstVisibleName(tester), 'Émile');
    });

    testWidgets('shows the search bar only when asked', (tester) async {
      await pumpPanel(tester);
      expect(find.byType(TextField), findsNothing);

      await pumpPanel(tester, showSearch: true);
      expect(find.byType(TextField), findsOneWidget);
    });

    testWidgets('closing the search clears the filter', (tester) async {
      await pumpPanel(tester, showSearch: true);
      await tester.enterText(find.byType(TextField), 'Marc');
      await tester.pump();
      expect(find.text('anna'), findsNothing);

      await pumpPanel(tester);
      expect(find.text('anna'), findsOneWidget);
    });

    group('collapsing', () {
      double namesHeight(WidgetTester tester) =>
          tester.getSize(find.byType(OpenTabsList)).height;

      testWidgets('starts with the names at their usual height', (
        tester,
      ) async {
        await pumpPanel(tester, selectedTab: tabs.first);

        expect(namesHeight(tester), 246);
      });

      testWidgets('tapping a name collapses the names', (tester) async {
        await pumpPanel(tester, selectedTab: tabs.first);

        await tester.tap(find.text('Bram'));
        await tester.pumpAndSettle();

        expect(namesHeight(tester), lessThan(200));
      });

      testWidgets('touching the items collapses the names', (tester) async {
        await pumpPanel(tester, selectedTab: tabs.first);

        await tester.tap(find.byType(SelectedTabDetails), warnIfMissed: false);
        await tester.pumpAndSettle();

        expect(namesHeight(tester), lessThan(200));
      });

      testWidgets('lines the selected name up on top of its items', (
        tester,
      ) async {
        final marc = tabs.firstWhere((tab) => tab.customerName == 'Marc');
        await pumpPanel(tester, selectedTab: marc);
        await tester.tap(find.byType(SelectedTabDetails), warnIfMissed: false);
        await tester.pumpAndSettle();

        final list = tester.getRect(find.byType(OpenTabsList));
        final details = tester.getRect(find.byType(SelectedTabDetails));
        final tile = tester.getRect(
          find
              .ancestor(of: find.text('Marc'), matching: find.byType(ClipRRect))
              .first,
        );

        expect(tile.bottom, closeTo(list.bottom, 1));
        expect(details.top, greaterThan(tile.bottom));
        expect(
          find.byWidgetPredicate(
            (widget) => widget is Divider && widget.height == 28,
          ),
          findsNothing,
        );
      });

      testWidgets('browsing the names shows the divider again', (tester) async {
        final marc = tabs.firstWhere((tab) => tab.customerName == 'Marc');
        await pumpPanel(tester, selectedTab: marc);
        await tester.tap(find.byType(SelectedTabDetails), warnIfMissed: false);
        await tester.pumpAndSettle();

        await tester.drag(find.byType(OpenTabsList), const Offset(0, -40));
        await tester.pumpAndSettle();

        expect(
          find.byWidgetPredicate(
            (widget) => widget is Divider && widget.height == 28,
          ),
          findsOneWidget,
        );
      });

      testWidgets('scrolling the names collapses the items', (tester) async {
        await pumpPanel(tester, selectedTab: tabs.first);
        await tester.tap(find.byType(SelectedTabDetails), warnIfMissed: false);
        await tester.pumpAndSettle();

        await tester.drag(find.byType(OpenTabsList), const Offset(0, -40));
        await tester.pumpAndSettle();

        final panel = tester.getSize(find.byType(TabPanel)).height;
        expect(namesHeight(tester), greaterThan(panel * 0.75));
      });
    });

    testWidgets('a letter without names goes to the next one', (tester) async {
      await pumpPanel(tester);

      await tapLetter(tester, 'Q');
      expect(firstVisibleName(tester), 'Rik');
    });
  });
}